To get the octal file permissions of a file on a Linux or Unix system, you can use the stat command with the --format flag.
Here is the general syntax for displaying octal file permissions with stat:
stat --format=%a file
Replace "file" with the name of the file.
For example, to display the octal file permissions of the file "test.txt," you can use the following command:
stat --format=%a test.txt
This will display the octal file permissions of the file, such as 644 for read/write permission for the owner and read-only permission for others.